Improvement in devices for cutting sheet metal for curved pipe-elbows



e. CHOATE. DEVICE FOR. CUTTING SHEET-METAL FOR CURVED PIPE-ELBOW'S.

No. 191,312. PatentedM'ay 29,1877. ay/f I GD 6 A .ATTnnNEYsf N. PETERS, PROTO LIIHOGRAPHER. WAS H|NGYDN.:D C

UNITED STATES PATENT OFFICE.

GREENE OHOA-TE, OF EAST SAGINAW, MICHIGAN.

IMPROVEMENT IN DEVICES FOR CUTTING SHEET METAL FOR CURVED PIPE-ELBOWS.

Specification forming part of Letters Patent No. 191,312, dated May 29, 1877; application filed April 30, 1877.

To all whom it may concern Be it known that I, GREENE (JHOATE, of East Saginaw, county of Saginaw, and State of Michigan, have invented a new and useful Improvement in Shears for Cutting Sections for Curved Sheet-Metal Elbows, of which the following is a specification:

Figure 1 is a plan view. Fig. 2 is a side elevation.

Similar letters of reference indicate corresponding parts.

The object of my invention is to provide shears for cutting the curved edges of sections of curved stove-pipe elbows.

In the drawing, A is the bed of the shears, having the cutting-edge a b, which is formed on an ogee or reversed curve. Arms cproject from the bed, and to them the arms (1 of the curved shear-bladeB are pivoted. The curved shear-bladeBis the counterpart of the curved cutting-edge of the bed A. Eyes 0 project downward from the arms d of the shear-blade B, for receiving rods that connect the same with a foot-lever. A spring, f, is attached to one of the arms 0, and bears against a projection on one of the arms 0, for throwing the curved shear-blade B upward.

Pins 9 project upward from the bed for engaging holes in the sheet to be cut by the shears. A sheet, 0, of metal, having been punched by another machine, is placed upon the bed of the shears, with. two of its perforations on the pins 9, as indicated by the drawing, when the curved shear-blade B is forced down by means of the foot-lever, and the sheet 0 is severed along the line of the cutting-edge a b.

The sheet is reversed and out upon the dotted line ef. It is again reversed and out upon the line g h. The sheet is thus cut by the shears into sections that may be formed into a curved elbow without trimming.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- The bed A, having the curved cutting-edge a 6, arms 0, and guide pins g, and the curved shear-blade B, having arms (1, in combination, substantially as shown and described.

GREENE GHOATE. 

